Try something less tacky, but it may also be that you are holding the grip to tightly. If all else, add an extra overgirp under it to have the main grip, another grip, and then the grip you want over those two to give more cushion. Though, I blieve you shouldn't be getting blisters and calluses if you have the right grip size for your hand and aren't gripping the handle too tightly when you are playing.